Screen for rock drills



June 1925 1,540,167

K. O. DUNCAN SCREEN FOR ROCK DRILL-S I Filed April 14, 1920 2Sheets-Sheet 1 June 2 1925 1,540,167

' K. O. DUNCAN SCREEN FOR ROCK DRILLS Filed April L4, 1920 2Sheefts$heet 2 Patented June 2, 1925.

KENNETH o. nuNsAn, on smrr naneiseo, cannon-ma, assreuolr jTO DENY???nocmnmnn unmirno'run ms LGQMPANY, or nnrrvnir, cones-a escapes-arrearsor. DELA ARE. 1

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ted c tai new se ul Immoram nt-s i Sc ee s for .30 1: r ls, Qtwh rh efellcwijngi a s meifie iqn', r t The presenti avent on relates m re-par:

cula-r 'yl t9 i l ng apnarat spttha i e in h the exhaust .f em the mehan sm era part thereof isutilized foncleansing the drill hole} In thistype o'f apparatus dirt and grit may find its waythroughthe ports intothe mechanismjthereby causingeXcessive wear and deteriorationl Theobject of the presentinvention is to provide novel and effective meansfor preventing the material entering the working parts through the meansthat directs the cleansing fluid to the bore of the drill steel.

In the accompanying drawings Figure 1 is a longitudinal section throughthe front portion of a drilling machine, and showing the novel means inplace.

Figure 2 is a sectional View on the line 2-2 of Figure 1.

Figure 3 is a detail sectional view on the line 3-3 of Figure 2,

Figure 4 is a detail cross sectional view,

Figure 5 is a perspective vew of the head member carrying the screen,

Figure 6 is a detail perspective view of the screen.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

In the embodiment illustrated, a drill actuating motor is employed,which may be of the well known type, and includes 'a cylinder, a portionof which is illustrated at 6, said cylinder containing a reciprocatinghammer piston 7 The front end of the cylinder 6 is provided with anintegral head portion 8 in the form of a sleeve on which is fitted acollar 9 carrying a rotary motor. This motor includes a casing orcylinder member 10 in which is the rotary piston mechanism 11. Motivefluid is supplied to the rotary motor through a suitable passageway 12.

The front head of the rotary motor cylinder 10 is in the form of acollar 13 having a wall 14 through which extends an exhaust p 15 or the.rater-y meter.

1 This sha k bese it re raen tage 'trated in Figures 3 and 5.

, llero ar; 5 3 surrouuds'the front-enact the yli de ead 8.. and iiuterpo ed between the yln er lfl-otth rotary"meto rand-anelem n 6-.hepar s an 1.6! egetli r een titute. a Q lll k head andsear ca athapartlfl ha 1 si,- .u ;ua1ed th re n, ratary ch ck: .7

o. ai d driv n y; thmisWa-ll at; he raters stator,-

gear a; 3 1twill h ac ed 1 housed Withinv the 1.3.. tllldxlfia 111W. 1.1919}? s-adarr dtereeeiretlw rear" an 1 ef uit bfledr l s eel?! caving,a ar ,2.-l; 1179. at .vlreh; else-115mg fluid aspirated .ta the bottomof the drill hole. The collar 13 is provided with a port 22 that opensinto a chamber 23 formed between the front end of the piston 7 and therear end of the chuck .17, the said collar being furthermore provided onopposite sides ofthe port 22 with sockets 24 that are open-ended, asillus- This port 22 allows the fluid exhausted into the gearcase throughthe port 15, to pass into the-chamber 23, and thus find access to thebore 21 80. of the drill steel. V

In order to prevent dirt and cuttings which may enter the chamber 23,from passing into the gear case, a screen 25 extends across the port 22.This screen has termina'l beads 26 preferably formed by Wrapping themargins of the screen around core rods 27. The beads detachably fitinthe sockets "24 and thus effectively hold the screen across the port.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention, will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of con struction may be resorted towithout departing from thespirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, What I claim as new, anddesire to secure by Letters Patent, is

1. The combination, in drilling apparae tus, of a drilling motor, achuck head on the front 'end thereof having an internal port and socketsformed" directly in the walls on opposite sides of the same, a chuck inthe chuck head, and a screen extending across the port andhavingterminal portions engaged in thesocketsr 2. The combination, indrilling apparatus, of a drilling 1notor,a chuck head on the front endthereof, comprising, separable sections, one of which is provided with acleansing fluid supply port and openended sockets formed directly in thewalls of the sections on opposite sides of the port, and a screenextending across the port and having its ends engaged in the sockets.

3. The combination, in drilling apparatus, of a drill actuating'motor, arotary motor mounted on one side of the same, a chuck head and gear casecomprising separable sections, one of which has a port, and socketsformed directly in the walls thereor on opposite sides of the port, arotatable chuck in the chuck head, a gearing connecting the rotary motorand chuck, and a screen across the port having terminal portions engagedin the sockets. I I I,

The combination in drilling apparatus, of a" drilling motor, achuck-head on" the front end thereof including a gear case,

said case comprisingdetachably associated sections, one of which has amotor surround ing collar and a gear enclosing portion, with a portbetween the two and sockets onopposite sides of said port,'a screen.extending across the port and, havingvits margins located in thesockets, and rotatable tool-receiving chuck mounted in the chuck head inadvanceof the screen. 5. The combination in drilling apparatus, of adrill chuck rotating motor, a drill chuck geared thereto and rotatedthereby, a casing enclosing the gearing and having an exhaust portopening from the motor and adapted to supply fluid toa steel placed inthe'chuck, said casing having sockets on opposite sides of the port, anda screen ha ving terminal beads engaged in the sockets, said beads beingformedby cores and the margins of the screeneneirc'ling said cores.

In testimony Whereofl I aflix my signature the presence of twowitnesses. v

' KENNETH O. DUNCAN. Witnesses: I

I C. H. LINDs'rRoM, E. J; CAS

